Anyone have any information on this unusual set?

https://earlytelevision.org/mario_bel-aire.html

Wow... that's almost, but not quite as unusual as the Kuba Komet! :scratch2:

By the serial number, I'll guess at least seven were built.

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It looks like something Natalie Kalmus would have turned out, but I'll guess a small, short lived maker of custom sets.

Does the chassis bear any resemblance to the 721?

The chassis looks to be intercarrier, from the tube lineup...

I found a Lamp by the same company.

https://www.chairish.com/product/1781251/1940s-mario-originals-los-angeles-hollywood-aquarium-lamp

The 3 knobs on the chassis and lack of a damper tube in the tube lineup makes me think it might use that infamous Muntz/Belmont chassis that had no damper, H afc or H Osc tube and instead was just a self oscillating output tube and HV rect.
Edit the tube layout looks similar to the Muntz. https://earlytelevision.org/muntz_m21.html

Odds are they bought that cheap chassis to put in their cool custom cabinet.

I can't read it but it looks like the Manufacturer's initials are listed on the label. Mfgd: x x x Co.

It has a 6W4 damper and 5U4 rectifier. Looks like a 6SN7 synchoguide horizontal oscillator.

Bit better than a Muntz.

Looks to me like it says CEE Co. Don't know who that would be.

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It has a 6W4 damper and 5U4 rectifier. Looks like a 6SN7 synchoguide horizontal oscillator.

Bit better than a Muntz.

Didn't everyone use the 6SN7/synchroguide setup? It seems like RCA did for a long while, their horizontal osc circuit didn't seem to change much..